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SimonF comments on Efficient Charity: Do Unto Others... - Less Wrong

130 Post author: Yvain 24 December 2010 09:26PM

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Comment author: SimonF 25 December 2010 12:44:04PM 3 points [-]

The reason for this is the compatibility of the blood types, for example O-negative-blood can be donated to everyone and is therefore used in emergencies where the blood type of the recipient is not known.